I can't access admin panel of my script : Invalid query You have an error in your SQL syntax - sql

Question

I have an error message when i try to access my script (php):
Invalid query: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 's marketing advertising'' at line 1
This is a admin php file contain mysql query
<?php
$stt_query = $ocdb->get_rows("SELECT * FROM ".$config->prefix."search order by id desc limit 13" );
if (count( $stt_query ) > 0) {
foreach ($stt_query as $row) :
?>
<li><?php echo $row['title'];?></li>
<?php
endforeach;
}
?>
the php query page:
<?php class OCDB { var $server = ""; var $port = ""; var $db = ""; var $user = ""; var $password = ""; var $prefix = ""; var $insert_id; var $link; function __construct($_server, $_port, $_db, $_user, $_password, $_prefix) { $this->server = $_server; $this->port = $_port; $this->db = $_db; $this->user = $_user; $this->password = $_password; $this->prefix = $_prefix; $host = $this->server; if (defined('DB_HOST_PORT') && !empty($this->port)) $host .= ':'.$this->port; $this->link = mysqli_connect($host, $this->user, $this->password) or die("Could not connect: " . mysqli_connect_error()); mysqli_select_db($this->link, $this->db) or die ('Can not use database : ' . mysqli_error($this->link)); mysqli_query($this->link, 'SET NAMES utf8'); } function get_row($_sql) { //$res = $this->link->query($_sql); //if ($this->link->error) { //try { //throw new Exception("MySQL error $mysqli->error <br> Query:<br> $query", $this->link->errno); //} catch(Exception $e ) { //echo "Error No: ".$e->getCode(). " - ". $e->getMessage() . "<br >"; //echo nl2br($e->getTraceAsString()); //} //} $result = mysqli_query($this->link, $_sql) or die("Invalid query: " . mysqli_error($this->link)); $row = mysqli_fetch_array($result, MYSQL_ASSOC); mysqli_free_result($result); return $row; mysqli_close($this->link); } function get_rows($_sql) { $rows = array(); $result = mysqli_query($this->link, $_sql) or die("Invalid query: " . mysqli_error($this->link)); while ($row = mysqli_fetch_array($result, MYSQL_ASSOC)) { $rows[] = $row; } mysqli_free_result($result); return $rows; } function get_var($_sql) { $result = mysqli_query($this->link, $_sql) or die("Invalid query: " . mysqli_error($this->link)); $row = mysqli_fetch_array($result, MYSQL_NUM); mysqli_free_result($result); if ($row && is_array($row)) return $row[0]; return false; } function query($_sql) { $result = mysqli_query($this->link, $_sql) or die("Invalid query: " . mysqli_error($this->link)); $this->insert_id = mysqli_insert_id($this->link); return $result; } function escape_string($_string) { return mysqli_real_escape_string($this->link, $_string); } } ?>
Please can you help me i can't access admin panel because of this error.
Thanks